The best Canon EF lenses constitute ... Also, while the maximum aperture of the lens is f/4.5, it can only shoot at f/4.5 when locked at its widest setting of 10mm (16mm equivalent); the maximum ...

The taller the column, the better the lens performance. CA (Chromatic Aberration) is measured with in-camera corrections switched off, as far as we can know anyway. Central results are very ...

The RF mount is wider than EF, though the older lenses ... requires expert manufacturing, and Canon has shown its mastery of the techniques with this 16mm lens. Its f/2.8 aperture and quiet ...